Set Appliance State:
| Isolate Mains Power to appliance as per TOPs P4 |
Set Multimeter to Resistance 
Remove connectors X15 and X13 from the PCB and
electrical connector to the diverter valve
electrical connector to the diverter valve
Measurement:
Test 1:
Measure the resistance between the blue wire at connector X15 and terminal 1 at the diverter valve connector.
Test 2:
Measure the resistance between the brown wire at connector X13 and terminal 3 at the diverter valve connector.
Test 3:
Measure the resistance between the earth wire at connector X13 and terminal 2 at the diverter valve connector.
Expect continuity / zero resistance on each test.
Also visually inspect the condition of the harness.
Measure the resistance between the blue wire at connector X15 and terminal 1 at the diverter valve connector.
Test 2:
Measure the resistance between the brown wire at connector X13 and terminal 3 at the diverter valve connector.
Test 3:
Measure the resistance between the earth wire at connector X13 and terminal 2 at the diverter valve connector.
Expect continuity / zero resistance on each test.
Also visually inspect the condition of the harness.
Isolate as per TOPs P4
and refit as necessary